Corrosion-resisting ferrous alloy



nets of combustion of fuels.

UNETED sums mecrronn, or BEAVER DAM, wrsconsriiz since.

CORROSION-RESISTING FERROUS ALLOY.

No Drawing.

To all whom z'tmay concern:

Be it known that I,-SILAs MoCL'UnE, a citizen of the United States, residin at Beaver Dam, in the county of Dodge, tate of Wisconsin, have invented certain new and useful Im rovements in Corrosion-Resisting Ferrous lloys; and I do hereby declare the following to be a full, .clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. This invention relates to 'ferrous alloys and articles made therefrom, and has for its object the provision of an im roved corro-' sion-resisting ferrous alloy. ore particularly, the object of the invention is the provision of an improved ferrous alloy which will betterresist the corrosive action of the products of combustion of fuel, and which is hence peculiarly adapted for use in the manufacture of those'partsof stoves, ranges, furnaces, and the like, subjected to the action of such products of combustion.

It appears to be definitely established that when copper in small amounts, from 0.15 to 0.25 per cent. is added to ordinary mild steel and irn, its resistance to the usual atmosphric corrosion is increased considerably. It also has been shown by investigators that under such conditions an increase of the copper content above that corrosion. Whil'esuch copper steels, low copper, show high resistance to atmospheric corrosion, such data cannot be applied to the corrosion under different conditions such as is obtained in the interior surfabe of water pipes, in salt water, and where steel is subjected tu the corrosive action of the prod- The products of combustion of fuels cause severe corrosion as is evidenced by the short life of the various parts of stoves, stove pipes, smoke stacks, and other constructions subjected to such action. This action is especially severe in domestic ranges in which the fireis not maintained continually. In such .a range the parts in contact with the prodnets of combustion are subjected to the destructive action of several corrosive agents. In addition to the carbon dioxid and moisture resulting from the combustion of .the carbon in the fuel there are also resent pyroligneous acid, tar and other distlllation products from wood and coal, soot, ammonia and sulfur dioxid, and other prod- I Specification of Letters Patent. 1 Patented June 1, 1920;

' a lication filed January 31, 1919. Serial No. 274,362.

, I i ucts when fuels other than wood and coal are used. When the stove is allowed to cool 1no1sture usually collects in the sooty deposits on the various surfaces that were hot enoughto be dry during the' time the fire was maintained, On or near the sea coast the ordinary steels and iron; substantially free from copper, but have in addition disf-v covered that the resistanceto corrosion of such ferrous. alloys is materiallyimproved and increased when the coppercontent-is excess of 0.50%. I have further foundthat';

as the copper content of such an alloy is increased beyond 0.50%, its.,corrosion'-res1st-.

words, the corrosion losses decrease as the copper percentage Increases. .However,

ing properties become; better, of in other due'to the dificulties of working ferrous ale loys containing a high percentage of copper, and in cast metals to the difficulty in securing an even distribution of the copper in theironor steel, the copper content cannot be indefinitely increased, and in the practice of the invention, I prefer to employ a copper content not much in excess of 1.0%. It will therefore be understood that- 'the upper limit of the copper content determined by the ability to secure an evfii; distribution of the copper in the ferrous al loy,'or by the ability to mechanically work the resulting ferrous alloy, as, for example,

sheets. a I I In carrying out the invention the copper may be added to the ingot during casting or may be ad ed to the molten iron or steel before castin at any suitable stage and in an rol ed into sheets mild steel ingots ing about 1.12% of copper, and have found such copper steel sheets to be remarkabl resistant to the corrosive action of'the prod of the beneficial effects in this connection J the ability of the mills to roll the alloy into suitable manner. I have suc essfully containnets of combustion of fuel. As an exam le resulting from the addition of approxi-.

mately 1.0% of copper tomild or soft steels, I callattentionatbthe following table which gives the analysis of certain copper steel,

.i madelof'a sheets together-with' the average losses in grams of equal areas of surface when exposed ,to the action of the products of com: bustion of burning fuel:

The present invention particularly contemplates the use of copper steel containing in excess of 0.50% of copper in the manu facture of articles which are subjected to the action of the products of combustion of fuel. In this connection, the invention is of particular value in the manufacture of articles made of sheet material, such as smoke stacks, stove flues and the like.

resent invention are much more resistant to the corrosive action of the products of combustion of burning fuel than if made of ordinary "steel or iron substantially free from copper, or containing less than about 0.25% of copper.

I claim:

1. An article of manufacture in the form of sheet metalvwhichis subjected to the action of the-products of combustion offuel errous alloy consisting principallyof 1ron and containing copper in ex Such articles when made of steel containing copper in the proportions contemplated by the cess of 0.50 ofone percent. but not in ex-.

cess of such amount as will prevent rolling of the ferrous alloy in'to sheets.

2. An articles of manufacture which is subjected to the action ofthe products of combustion of fuel and made from an alloy consisting principally; of iron and containing copper in excess of 0.50 of one per cent. and

capable of being mechanically Worked.

3. Articles of manufacture consisting of parts of stoves that are subjected to the action of the products of combustion of fuel and Which are made from an alloy consisting principally of iron and containing copper in excess of 0.50 of one .per cent. but not in excess of such amount as Will preclude a substantially even distribution of the copper in the alloy.

4. An article of manufacture designed to be subjected to the products of combustion of,burnin fuel and made of a corrosionresisting a by consisting principally of iron and containing approximately 1.0 per cent.

of copper.

5. An article of manufacture which is subjected to the action ofthe products of combustion of fuel and made from an alloy consisting principally of iron and containing copper in excess of 0.50 of one per cent.

but'not in excess of such amount as Will.

preclude a substantially even distribution of the copper in the.alloy. I In testimony whereof I afiix my signature.

SILAS McCLURE 

